Indexes typically only work on the left-hand-side. Rewrite as
select * from ip_test where startNum <= 3061579775 and endNum >= 3061579775;
Magic will happen.
2010/11/9 wroxdb <wroxdb@stripped>
> Hello,
>
> I have a query below:
>
> mysql> select * from ip_test where 3061579775 between startNum and endNum;
> +------------+------------+---------+----------+------+--------+
> | startNum | endNum | country | province | city | isp |
> +------------+------------+---------+----------+------+--------+
> | 3061514240 | 3061579775 | 中国 | 河南 | | 联通 |
> +------------+------------+---------+----------+------+--------+
>
>
> the "desc" shows it isn't using the index:
>
> mysql> desc select * from ip_test where 3061579775 between startNum and
> endNum;
>
>
> +----+-------------+---------+------+-----------------+------+---------+------+--------+-------------+
> | id | select_type | table | type | possible_keys | key | key_len
> | ref | rows | Extra |
>
>
> +----+-------------+---------+------+-----------------+------+---------+------+--------+-------------+
> | 1 | SIMPLE | ip_test | ALL | startNum,endNum | NULL | NULL
> | NULL | 396528 | Using where |
>
>
> +----+-------------+---------+------+-----------------+------+---------+------+--------+-------------+
> 1 row in set (0.01 sec)
>
>
> the table structure is:
>
> CREATE TABLE `ip_test` (
> `startNum` double(20,0) default NULL,
> `endNum` double(20,0) default NULL,
> `country` varchar(50) NOT NULL default '',
> `province` varchar(50) NOT NULL default '',
> `city` varchar(50) NOT NULL default '',
> `isp` varchar(100) default NULL,
> KEY `startNum` (`startNum`),
> KEY `endNum` (`endNum`)
> ) ENGINE=MyISAM DEFAULT CHARSET=utf8
>
>
>
> please help, thanks in advance.
>
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